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  <head>
    <meta charset="UTF-8">
    <title></title>
  </head>
  <body>
    <pre id="output"></pre>
    <script>
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        if (ev.data === 'close') {
          output.textContent += 'close request\n';
          ev.source.postMessage('popup-closed', location.origin);
          window.close();
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      });
      if (window.opener) {
        window.focus();
        output.textContent += 'send initialized';
        window.opener.postMessage('popup-initialized', location.origin);
      }
    </script>
  </body>
</html>
